Explosive-engine.



Patented Nov. V25, |902.`

`No.V 714,492.

F. LAGouTTE. ExPLoslvE ENGINE.

` (Applicatiqn med Jun@ 26.19003 `(No midelJ 2 sheets-sheet 2,

tors, of which the following is a full, clear, and

" of a motorworking with a prexhaust adjafor insuring the cooling of the wall of the cyl- `permitting the discharge of exhaust-gases `through the conduit therefor and preventing `the direct discharge thereof to theatmos- Ait covers them again.

" Nirnn "STATES ATENT FFICE.

rRANoois LAeoUTTE, or AsNinnEs, FRANCE.

EXPLOSlVEj-ENGINE.

SPECIFICATION forming part of LettersPatent No. 714,492, dated November 25, 1902.

Application filed une 26, 190i).

To @ZZ whom t may concern: i

Be it knownthat I, FnANois LAGOUTTE, engineer, a citizen of the French Republic, residing at Asnires,department of Seine, France, have invented certain new and useful Improvements inInternal-Combustion MoeXact description.

`This invention relates to certain improve-` ments applicable to internal-combustion motors (gas, oil, and the like) for the purpose of increasing the cooling ofthe Walls of the cylinders and the parts connected thereto.

These improvements consist of a means applicable to motors working with prexhaust inder adjacent to the orifices of the preexhaust, while also effecting a discharge of the burned gases into an exhaust-muffler.

The preferred form of my invention is illustrated in the accompanying two sheets of drawings, in Whichj Figure lis a section of the motor, taken through the cylinder and exhaust-conduit. Fig.2 is an enlarged sectional view of the automatic valve controlling the passage of the exhaust-gases through said conduit and the inlet of fresh air thereto, said valveibeiug in a` position permitting the inlet of fresh airto the motor-cylinder. Fig. 3 is a similar section of said valve, showing it in a position for phere. e i I will describe the arrangement which enables me tocool the portion of the cylinder cent to the said exhaust-ports.- 'Ihe preexhaust is produced by forming in the Wall of the cylinder a short distance from its forward end a number-.of openings which are uncovered during the period from the instant when the pist-on clears them to finish itsforward stroke until the moment when coming back During this time part of the burned gases will escape throughthe openings. VWhen the piston performing its back stroke has passed these, the exhaust continues through the ordinary exhaust-valve. This method of working presents certain advantages, but it also entails certain inconven- Serial No. 21,680. (No model.)

iences. The latter consist in that if the openings deliver to the outer air the exhaust gives rise to a loud noise, which is disagreeable,

and also if those openings deliver into a chamber c om municating with a muflier the exhaust no longer takes place easily and the wall of the` cylinder near the orifices becomes heated toan injurious extent. i

The exhaust into the `atmosphere but for the noise would be the most advantageous. In this case the Working is as follows: When the piston performs its forward stroke (eX- plosion) and haspassed the openings, the prexhaust takes place until the return of the piston, and the wall near the holes is heated by reason of the passing of the hot gases. Then the piston in'its backward stroke closes this outlet for the burned gases, and the remaining gases are exhausted through the eX- haust-valve. The rearward stroke (compression) being finished, the piston again starts forward, performing the suction-stroke. The fresh gases enter into the cylinder and when the piston uncovers the openings the fresh charge 'continues to be fed in through the inlet-valve; but at the same time air is admitted through the openings, cooling the surrounding wall, and this continues until the moment when the piston, being at the end of its stroke, suction ceases. The piston coming back, a part of the air which enters into the cylinder is driven out through the openings, drawing with it a small quantity of rfresh gas with traces of burned gas, as well as a certain quantity of heat in consequence, until the moment when the openings are closed by the piston, which then compresses the fresh charge.

wherein the latter are formed; third, expulsion of a portion of the indrawn air, mixed with traces of fresh and burned gases, some heat passing out therewith. In these conditions' the wall of the cylinder adjacent to the prexhaust-ports is cooled; but, `ashas been seen above, this procedure is inadmissible by reason of the noise produced by the exhaust into the air. Exhaust into a chamber communicating with a muffler is indispensable; but then the working becomes very defective. In such case the gases are not exhausted quickly enough by reason of the piping which conducts them to the muflier and by reason also of the back pressure in the latter itself. At the time of the exhaust there takes place, when the piston uncovers the openings and continues its forward stroke, not a reentrance of air, but a rentrance of hot gases. The state of carburation of the fresh explosive mixture which is at this moment in the cylinderis altered, the motor works badly, and the wall adjacent to the openings attains a high temperature, which is another cause of bad working.

I might avoid the rentrance of the burned gases by causing the exhaust-ports to deliver into a chamber furnished with a valve which opens from the interior toward the exterior and would allow the gases to pass out and prevent their returning; but then cooling of the wall around the openings would no longer take place.

My arrangement enables me to effect the escape into a chamber connected with a muffier, while retaining the advantages of the exhaust into the open air. It comprises an exhaust-chamber b, into which'open the preexhaust-ports a a. This chamber is joined to a pipe c, conducting to the muflier, and these together form a conduit for the passage of the exhaust-gases.

The communication of the chamber b with the pipe c is effected by means of a valve d, which through connected valve mechanism permits at the desired time communication between the chamber l), and therefore the cylinder, and the outer atmosphere, as will be described.

The valve CZ is recalled to its seat bya spring r, acting upen its rod e, suitably guided. This valve d is integral at its lower face with a sleeve f, open at its other end and which is iitted with openings g, of which the height is about equal to the extent ofthe stroke of the valve d. lThis sleevefserves also as a guide and slides within a suitable socket or bearing in the exhaust-chamber. In this socket, within which the sleeve f moves, are formed passages h, delivering from the sleeve into the chamber b, as shown by the arrow.

The openings g of the sleevefand the passages h are arranged in such a manner that when the valve CZ rests in its seat they coincide, and when the valve is raised from its seat they are no longer opposite one another. The interior space of the sleeve is in permanent communication with the exterior atmosphere by means of the orifices 7c, formed in the wall of the iixed portion guiding the rod of the valve. The working of this arrangement is the following: At the moment when the prexhaust takes place through the openings cL a the burned gases entering into the chamber b raise the valve d, and the escape takes place by means of a pipe c, conducting to the exhaust-muffler. At this moment the openings g of the sleeve f are not opposite the passages h. When the prexhaust ceases because the openings ahave been again covered by the piston in its backward stroke, the valve CZ returns to its seat, and the openings g then coincide with the passages h, reestablishing communication between the escapechamber b and the outer air. Consequently when at the time of suction, which afterward takes place, the openings ct will be again uncovered a rentrance of fresh air will be produced in the cylinder through the openings g of the sleeve, the passages h, the chamber b, and the openings a 0;. I thus obtain an efiicient cooling of the wall of the cylinder in the neighborhood of the prexhaust-openings, while effecting this exhaust into a chamber communicating with an exhaust-muffler.

I wish to remark that I do not limit myself to the arrangement of the sleeve f for setting up communication4 between the chamber b and the atmosphere. I may replace it by any one of numerous equivalent valve constructions well known to those skilled in the art which would produce the same result.

The essential feature of my invention is the outwardly-opening check-valve d in the conduit provided for the exhaust-gases and airinlet, such as 7c, to said conduit located at a point intermediate of the valve CZ and the ports a, through which the conduit for the exhaust-gases connects with the motor-cylinder, said air-inlet being controlled by valve means which open when the valve d closes, and vice versa, or, to express the idea in other words, which open when there is induction of gases to the motor-cylinder and close when there is eduction of gases from said cylinder.

Having therefore described my invention, what I claim as new, and desire to protect by Letters Patent, is-

l. In an internal-combustion motor, the combination of a conduit for exhaust-gases leading from the motor-cylinder, said conduit having an air-inlet near the point of connection to the motor-cylinder,- valve means controlling the said inlet, valve means controlling the iiow of gases through the conduit and located farther from the motor-cylinder than the said air-inlet, and connecting mechanism which causes one valve to be open when the other is closed, and vice versa.

2. In an internal-combustion motor, the combination of a conduit for exhaust-gases leading from the motor-cylinder, an outwardly-opening check-valve in said conduit, an air-inlet to said conduit between the checkvalve and the connection to the motor-cylinder and a valve in said inlet which automatically opens upon induction of gases to said cylinder and closes upon the eduction of gases therefrom.

ICO

3. In an internal-combustion motor, the tionedhvalve being' arranged to open only when to combination of acylinder havngprexhaustthe first-mentioned check-valve is closed.

l ports located n the side Walls thereof, e con- In testimony that I claim the foregoing as duit for exhaust-gases connected thereto, an myinvention I have signed my name in presoutwardly-opening check-valve in said conence of two subscribing witnesses.

duit, an air-inlet to said conduit located be- FRANQOIS LAGOUTTE. tween the connection to the cylinder and the `Vlitnessies:

; above-described check-valve, and a Valve l GUSTAVE DUMONT,

which controls seid air-inlet, seid last-menl EDWARD P. MACLEAN. 

